1 /* 2 * 3 * sched-messaging.c 4 * 5 * messaging: Benchmark for scheduler and IPC mechanisms 6 * 7 * Based on hackbench by Rusty Russell <rusty@rustcorp.com.au> 8 * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> 9 * 10 */ 11 12 #include "../perf.h" 13 #include "../util/util.h" 14 #include "../util/parse-options.h" 15 #include "../builtin.h" 16 #include "bench.h" 17 18 /* Test groups of 20 processes spraying to 20 receivers */ 19 #include <pthread.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 #include <errno.h> 24 #include <unistd.h> 25 #include <sys/types.h> 26 #include <sys/socket.h> 27 #include <sys/wait.h> 28 #include <sys/time.h> 29 #include <poll.h> 30 #include <limits.h> 31 #include <err.h> 32 33 #define DATASIZE 100 34 35 static bool use_pipes = false; 36 static unsigned int loops = 100; 37 static bool thread_mode = false; 38 static unsigned int num_groups = 10; 39 40 struct sender_context { 41 unsigned int num_fds; 42 int ready_out; 43 int wakefd; 44 int out_fds[0]; 45 }; 46 47 struct receiver_context { 48 unsigned int num_packets; 49 int in_fds[2]; 50 int ready_out; 51 int wakefd; 52 }; 53 54 static void fdpair(int fds[2]) 55 { 56 if (use_pipes) { 57 if (pipe(fds) == 0) 58 return; 59 } else { 60 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0) 61 return; 62 } 63 64 err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()"); 65 } 66 67 /* Block until we're ready to go */ 68 static void ready(int ready_out, int wakefd) 69 { 70 char dummy; 71 struct pollfd pollfd = { .fd = wakefd, .events = POLLIN }; 72 73 /* Tell them we're ready. */ 74 if (write(ready_out, &dummy, 1) != 1) 75 err(EXIT_FAILURE, "CLIENT: ready write"); 76 77 /* Wait for "GO" signal */ 78 if (poll(&pollfd, 1, -1) != 1) 79 err(EXIT_FAILURE, "poll"); 80 } 81 82 /* Sender sprays loops messages down each file descriptor */ 83 static void *sender(struct sender_context *ctx) 84 { 85 char data[DATASIZE]; 86 unsigned int i, j; 87 88 ready(ctx->ready_out, ctx->wakefd); 89 90 /* Now pump to every receiver. */ 91 for (i = 0; i < loops; i++) { 92 for (j = 0; j < ctx->num_fds; j++) { 93 int ret, done = 0; 94 95 again: 96 ret = write(ctx->out_fds[j], data + done, 97 sizeof(data)-done); 98 if (ret < 0) 99 err(EXIT_FAILURE, "SENDER: write"); 100 done += ret; 101 if (done < DATASIZE) 102 goto again; 103 } 104 } 105 106 return NULL; 107 } 108 109 110 /* One receiver per fd */ 111 static void *receiver(struct receiver_context* ctx) 112 { 113 unsigned int i; 114 115 if (!thread_mode) 116 close(ctx->in_fds[1]); 117 118 /* Wait for start... */ 119 ready(ctx->ready_out, ctx->wakefd); 120 121 /* Receive them all */ 122 for (i = 0; i < ctx->num_packets; i++) { 123 char data[DATASIZE]; 124 int ret, done = 0; 125 126 again: 127 ret = read(ctx->in_fds[0], data + done, DATASIZE - done); 128 if (ret < 0) 129 err(EXIT_FAILURE, "SERVER: read"); 130 done += ret; 131 if (done < DATASIZE) 132 goto again; 133 } 134 135 return NULL; 136 } 137 138 static pthread_t create_worker(void *ctx, void *(*func)(void *)) 139 { 140 pthread_attr_t attr; 141 pthread_t childid; 142 int ret; 143 144 if (!thread_mode) { 145 /* process mode */ 146 /* Fork the receiver. */ 147 switch (fork()) { 148 case -1: 149 err(EXIT_FAILURE, "fork()"); 150 break; 151 case 0: 152 (*func) (ctx); 153 exit(0); 154 break; 155 default: 156 break; 157 } 158 159 return (pthread_t)0; 160 } 161 162 if (pthread_attr_init(&attr) != 0) 163 err(EXIT_FAILURE, "pthread_attr_init:"); 164 165 #ifndef __ia64__ 166 if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0) 167 err(EXIT_FAILURE, "pthread_attr_setstacksize"); 168 #endif 169 170 ret = pthread_create(&childid, &attr, func, ctx); 171 if (ret != 0) 172 err(EXIT_FAILURE, "pthread_create failed"); 173 174 return childid; 175 } 176 177 static void reap_worker(pthread_t id) 178 { 179 int proc_status; 180 void *thread_status; 181 182 if (!thread_mode) { 183 /* process mode */ 184 wait(&proc_status); 185 if (!WIFEXITED(proc_status)) 186 exit(1); 187 } else { 188 pthread_join(id, &thread_status); 189 } 190 } 191 192 /* One group of senders and receivers */ 193 static unsigned int group(pthread_t *pth, 194 unsigned int num_fds, 195 int ready_out, 196 int wakefd) 197 { 198 unsigned int i; 199 struct sender_context *snd_ctx = malloc(sizeof(struct sender_context) 200 + num_fds * sizeof(int)); 201 202 if (!snd_ctx) 203 err(EXIT_FAILURE, "malloc()"); 204 205 for (i = 0; i < num_fds; i++) { 206 int fds[2]; 207 struct receiver_context *ctx = malloc(sizeof(*ctx)); 208 209 if (!ctx) 210 err(EXIT_FAILURE, "malloc()"); 211 212 213 /* Create the pipe between client and server */ 214 fdpair(fds); 215 216 ctx->num_packets = num_fds * loops; 217 ctx->in_fds[0] = fds[0]; 218 ctx->in_fds[1] = fds[1]; 219 ctx->ready_out = ready_out; 220 ctx->wakefd = wakefd; 221 222 pth[i] = create_worker(ctx, (void *)receiver); 223 224 snd_ctx->out_fds[i] = fds[1]; 225 if (!thread_mode) 226 close(fds[0]); 227 } 228 229 /* Now we have all the fds, fork the senders */ 230 for (i = 0; i < num_fds; i++) { 231 snd_ctx->ready_out = ready_out; 232 snd_ctx->wakefd = wakefd; 233 snd_ctx->num_fds = num_fds; 234 235 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender); 236 } 237 238 /* Close the fds we have left */ 239 if (!thread_mode) 240 for (i = 0; i < num_fds; i++) 241 close(snd_ctx->out_fds[i]); 242 243 /* Return number of children to reap */ 244 return num_fds * 2; 245 } 246 247 static const struct option options[] = { 248 OPT_BOOLEAN('p', "pipe", &use_pipes, 249 "Use pipe() instead of socketpair()"), 250 OPT_BOOLEAN('t', "thread", &thread_mode, 251 "Be multi thread instead of multi process"), 252 OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"), 253 OPT_UINTEGER('l', "loop", &loops, "Specify number of loops"), 254 OPT_END() 255 }; 256 257 static const char * const bench_sched_message_usage[] = { 258 "perf bench sched messaging <options>", 259 NULL 260 }; 261 262 int bench_sched_messaging(int argc, const char **argv, 263 const char *prefix __maybe_unused) 264 { 265 unsigned int i, total_children; 266 struct timeval start, stop, diff; 267 unsigned int num_fds = 20; 268 int readyfds[2], wakefds[2]; 269 char dummy; 270 pthread_t *pth_tab; 271 272 argc = parse_options(argc, argv, options, 273 bench_sched_message_usage, 0); 274 275 pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t)); 276 if (!pth_tab) 277 err(EXIT_FAILURE, "main:malloc()"); 278 279 fdpair(readyfds); 280 fdpair(wakefds); 281 282 total_children = 0; 283 for (i = 0; i < num_groups; i++) 284 total_children += group(pth_tab+total_children, num_fds, 285 readyfds[1], wakefds[0]); 286 287 /* Wait for everyone to be ready */ 288 for (i = 0; i < total_children; i++) 289 if (read(readyfds[0], &dummy, 1) != 1) 290 err(EXIT_FAILURE, "Reading for readyfds"); 291 292 gettimeofday(&start, NULL); 293 294 /* Kick them off */ 295 if (write(wakefds[1], &dummy, 1) != 1) 296 err(EXIT_FAILURE, "Writing to start them"); 297 298 /* Reap them all */ 299 for (i = 0; i < total_children; i++) 300 reap_worker(pth_tab[i]); 301 302 gettimeofday(&stop, NULL); 303 304 timersub(&stop, &start, &diff); 305 306 switch (bench_format) { 307 case BENCH_FORMAT_DEFAULT: 308 printf("# %d sender and receiver %s per group\n", 309 num_fds, thread_mode ? "threads" : "processes"); 310 printf("# %d groups == %d %s run\n\n", 311 num_groups, num_groups * 2 * num_fds, 312 thread_mode ? "threads" : "processes"); 313 printf(" %14s: %lu.%03lu [sec]\n", "Total time", 314 diff.tv_sec, 315 (unsigned long) (diff.tv_usec/1000)); 316 break; 317 case BENCH_FORMAT_SIMPLE: 318 printf("%lu.%03lu\n", diff.tv_sec, 319 (unsigned long) (diff.tv_usec/1000)); 320 break; 321 default: 322 /* reaching here is something disaster */ 323 fprintf(stderr, "Unknown format:%d\n", bench_format); 324 exit(1); 325 break; 326 } 327 328 free(pth_tab); 329 330 return 0; 331 } 332